AIS: Large refactor to separate packet decode from UI/log formatting.

firmware/application/app_ais.hpp

@@ -25,14 +25,69 @@
 #include "ui_console.hpp"
 #include "message.hpp"
 #include "log_file.hpp"
+#include "field_reader.hpp"
 
+#include <cstdint>
+#include <cstddef>
 #include <string>
+#include <bitset>
 #include <utility>
 
 namespace baseband {
 namespace ais {
 
-using decoded_packet = std::pair<std::string, std::string>;
+struct BitRemap {
+	size_t operator()(const size_t bit_index) const {
+		return bit_index ^ 7;
+	}
+};
+
+using FieldReader = ::FieldReader<std::bitset<1024>, BitRemap>;
+
+struct DateTime {
+	uint16_t year;
+	uint8_t month;
+	uint8_t day;
+	uint8_t hour;
+	uint8_t minute;
+	uint8_t second;
+};
+
+using Latitude = int32_t;
+using Longitude = int32_t;
+
+class Packet {
+public:
+	constexpr Packet(
+		const std::bitset<1024>& payload,
+		const size_t payload_length
+	) : payload_ { payload },
+		payload_length_ { payload_length },
+		field_ { payload_ }
+	{
+	}
+
+	size_t length() const;
+	
+	bool is_valid() const;
+
+	uint32_t message_id() const;
+	uint32_t source_id() const;
+
+	uint32_t read(const size_t start_bit, const size_t length) const;
+
+	std::string text(const size_t start_bit, const size_t character_count) const;
+
+	DateTime datetime(const size_t start_bit) const;
+
+	Latitude latitude(const size_t start_bit) const;
+	Longitude longitude(const size_t start_bit) const;
+
+private:
+	const std::bitset<1024> payload_;
+	const size_t payload_length_;
+	const FieldReader field_;
+};
 
 } /* namespace ais */
 } /* namespace baseband */
@@ -41,7 +96,7 @@ class AISModel {
 public:
 	AISModel();
 
-	baseband::ais::decoded_packet on_packet(const AISPacketMessage& message);
+	bool on_packet(const baseband::ais::Packet& packet);
 
 private:
 	LogFile log_file;
@@ -57,7 +112,7 @@ public:
 private:
 	AISModel model;
 
-	void log(const baseband::ais::decoded_packet decoded);
+	void log(const baseband::ais::Packet& packet);
 };
 
 } /* namespace ui */